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Home >> Ford >> 2023 >> Mustang Mach-E Select, RWD >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Supplemental Restraint System - Pinpoint Tests Aa - AZ >> Pinpoint Test AE: B140D:11, B140D:12, B140D:13 And B140D:1D

Pinpoint Test AE: B140D:11, B140D:12, B140D:13 And B140D:1D

  1. Refer to SUPPLEMENTAL RESTRAINT SYSTEM for schematic and connector information.

    Normal Operation and Fault Conditions 

    The RCM continuously monitors the second row passenger seatbelt buckle sensor circuits for the following faults:

    • Open circuit
    • Short to voltage
    • Short to ground
    • Current out of range
    • Faulted second row passenger seatbelt buckle sensor

    If a fault is detected, the RCM stores DTC B140D:11, B140D:12, B140D:13 or B140D:1D in memory and sends a message to the IPC to illuminate the airbag warning indicator.

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    RCM B140D:11 Second Row Passenger Side Seatbelt Sensor: Circuit Short To Ground A fault is indicated when the RCM senses a short to ground on the second row passenger seatbelt buckle sensor circuit for more than 6 seconds.
    RCM B140D:12 Second Row Passenger Side Seatbelt Sensor: Circuit Short To Battery A fault is indicated when the RCM senses a short to voltage on the second row passenger seatbelt buckle sensor circuit for more than 6 seconds.
    RCM B140D:13 Second Row Passenger Side Seatbelt Sensor: Circuit Open A fault is indicated when the RCM senses an open on either second row passenger seatbelt buckle sensor circuit for more than 6 seconds.
    RCM B140D:1D Second Row Passenger Side Seatbelt Sensor: Circuit Current Out Of Range A fault is indicated when the RCM measures current outside of an acceptable range on the second row passenger seatbelt buckle sensor circuit for more than 6 seconds.

    Possible Sources 

    • Wiring, terminals or connectors
    • Second row passenger seatbelt buckle sensor
    • RCM

    Visual Inspection and Pre-checks 

    • Inspect for a damaged second row passenger seatbelt buckle.
    • Inspect for damaged wiring harness(es).
    • Inspect for loose or damaged connectors.

    WARNING: Incorrect repair techniques or actions can cause an accidental Supplemental Restraint System (SRS) deployment. Never compromise or depart from these instructions. Failure to precisely follow all instructions could result in serious personal injury from an accidental deployment.
    NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.
    NOTE: Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint test.
    NOTE: SRS components should only be disconnected or reconnected when instructed to do so within a pinpoint test step. Failure to follow this instruction may result in incorrect diagnosis of the SRS.
    NOTE: Always make sure the correct SRS component is being installed. Parts released for other vehicles may not be compatible even if they appear physically similar. Check the part number listed in the Ford parts catalog to make sure the correct component is being installed. If an incorrect SRS component is installed, Diagnostic Trouble Codes (DTCs) may set.
    NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
    NOTE: Do not probe any impact sensor. The impact sensor cannot be tested using a multi-meter.

  2. AE1 RETRIEVE RCM (RESTRAINTS CONTROL MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)

    WARNING: Before beginning any service procedure, refer to Safety Warnings in General Information. Failure to follow this instruction may result in serious personal injury.

    REFER to: Pyrotechnic Device Health and Safety Precautions .

    • Ignition ON.

    • Using a diagnostic scan tool, perform RCM self-test.

    Was DTC B140D:11, B140D:12, B140D:13 and B140D:1D retrieved on-demand during self-test? 

    Yes  This fault cannot be cleared until it is corrected and the DTC is no longer retrieved on-demand during self-test.For DTC B140D:11 or B140D:1D, GO to AE2 For DTC B140D:12, GO to AE4 For DTC B140D:13, GO to AE5 
    No  This is an intermittent fault when present as a CMDTC only. GO to AE10 

  3. AE2 CHECK THE SECOND ROW PASSENGER SEATBELT BUCKLE SENSOR DTC (DIAGNOSTIC TROUBLE CODE) FOR A FAULT STATUS CHANGE (SHORT TO GROUND OR CURRENT OUT OF RANGE INDICATED)

    NOTE: This pinpoint test step attempts to change the fault reported by the RCM by inducing a different fault condition. If the reported fault changes, this indicates the RCM is functioning correctly and is not the source of the fault.

    • Ignition OFF.

    • Disconnect Second Row Passenger Seatbelt Buckle C3808.

    • Ignition ON.

    • Using a diagnostic scan tool, perform RCM self-test.

    • DIAGNOSTIC TIP: 

      When viewing Diagnostic Trouble Codes (DTCs) with the second row passenger seatbelt buckle sensor disconnected, an open circuit fault is normally retrieved.

    Did the on-demand DTC change from B140D:11 or B140D:1D to B140D:13? 

    Yes  GO to AE8 
    No  For DTC B140D:11, GO to AE3 For DTC B140D:1D, GO to AE9 

  4. AE3 CHECK THE SECOND ROW PASSENGER SEATBELT BUCKLE SENSOR CIRCUIT FOR A SHORT TO GROUND

    • Ignition OFF.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C3808 Pin 1
      GFD769505Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to AE9 
    No  REPAIR the circuit. Refer to OEM_CONNECTOR_REPAIR_PROCEDURES for schematic and connector information. GO to AE11 

  5. AE4 CHECK THE SECOND ROW PASSENGER SEATBELT BUCKLE SENSOR CIRCUIT FOR A SHORT TO VOLTAGE

    • Ignition OFF.

    • Disconnect Second Row Passenger Seatbelt Buckle C3808.

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C3808 Pin 1
      GFD769508Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the circuit. Refer to OEM_CONNECTOR_REPAIR_PROCEDURES for schematic and connector information. GO to AE11 
    No  GO to AE9 

  6. AE5 CHECK THE SECOND ROW PASSENGER SEATBELT BUCKLE SENSOR DTC (DIAGNOSTIC TROUBLE CODE) FOR A FAULT STATUS CHANGE (OPEN INDICATED)

    NOTE: This pinpoint test step attempts to change the fault reported by the RCM by inducing a different fault condition. If the reported fault changes, this indicates the RCM is functioning correctly and is not the source of the fault.

    • Ignition OFF.

    • Disconnect Second Row Passenger Seatbelt Buckle C3808.

    • Connect a fused jumper wire:
      Lead 1 Measurement / Action Lead 2
      C3808 Pin 1
      GFD769507Courtesy of FORD MOTOR COMPANY
      		 C3808 Pin 2

    • Ignition ON.

    • Using a diagnostic scan tool, perform RCM self-test.

    • DIAGNOSTIC TIP: 

      When viewing Diagnostic Trouble Codes (DTCs) with the second row passenger seatbelt buckle sensor circuits shorted together, a short to ground fault is normally retrieved.

    Did the on-demand DTC change from B140D:13 to B140D:11? 

    Yes  REMOVE the fused jumper wire and GO to AE8 
    No  REMOVE the fused jumper wire and GO to AE6 

  7. AE6 CHECK THE SECOND ROW PASSENGER SEATBELT BUCKLE SENSOR CIRCUIT FOR AN OPEN

    • Ignition OFF.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C310B Pin 58
      GFD769505Courtesy of FORD MOTOR COMPANY
      		 C3808 Pin 1

    Is the resistance less than 0.5 ohm? 

    Yes  GO to AE7 
    No  REPAIR the circuit. Refer to OEM_CONNECTOR_REPAIR_PROCEDURES for schematic and connector information. GO to AE11 

  8. AE7 CHECK THE SECOND ROW PASSENGER SEATBELT BUCKLE SENSOR GROUND CIRCUIT FOR AN OPEN

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C3808 Pin 2
      GFD769505Courtesy of FORD MOTOR COMPANY
      		 C310B Pin 53

    Is the resistance less than 3 ohms? 

    Yes  GO to AE9 
    No  REPAIR the circuit. Refer to OEM_CONNECTOR_REPAIR_PROCEDURES for schematic and connector information. GO to AE11 

  9. AE8 CONFIRM THE SECOND ROW PASSENGER SEATBELT BUCKLE SENSOR FAULT

    NOTE: Make sure all SRS components and the RCM electrical connectors are connected before carrying out the self-test. If not, Diagnostic Trouble Codes (DTCs) will be recorded.

    • Ignition OFF.

    • Prior to reconnecting any previously disconnected SRS component:

      • inspect connector(s) (including any inline connectors) for pushed-out, loose or spread terminals and loose or frayed wire connections at terminals.
      • inspect wire harness for any damaged, pinched, cut or pierced wires.
      • inspect RCM C310A and C310B Connector Position Assurance (CPA) lever/lock for correct operation.
      • repair any concerns found. Refer to OEM_CONNECTOR_REPAIR_PROCEDURES for schematic and connector information.

    • Connect Second Row Passenger Seatbelt Buckle C3808.

    • Ignition ON.

    • Using a diagnostic scan tool, perform RCM self-test.

    Was the original DTC retrieved on-demand during self-test? 

    Yes  INSTALL a new second row passenger seatbelt buckle (includes buckle sensor). REFER to: Rear Seatbelt Buckle RH and Center . GO to AE11 
    No  In the process of diagnosing the fault, the fault condition has become intermittent. Do not install any new SRS components at this time. Install SRS components only when directed to do so in the pinpoint test. GO to AE10 

  10. AE9 CONFIRM THE RCM (RESTRAINTS CONTROL MODULE) FAULT

    NOTE: Make sure all SRS components and the RCM electrical connectors are connected before carrying out the self-test. If not, Diagnostic Trouble Codes (DTCs) will be recorded.

    • Ignition OFF.

    • Prior to reconnecting any previously disconnected SRS component:

      • inspect connector(s) (including any inline connectors) for pushed-out, loose or spread terminals and loose or frayed wire connections at terminals.
      • inspect wire harness for any damaged, pinched, cut or pierced wires.
      • inspect RCM C310A and C310B Connector Position Assurance (CPA) lever/lock for correct operation.
      • repair any concerns found. Refer to OEM_CONNECTOR_REPAIR_PROCEDURES for schematic and connector information.

    • Connect RCM C310A and C310B (if previously disconnected).

    • Connect Second Row Passenger Seatbelt Buckle C3808.

    • Ignition ON.

    • Using a diagnostic scan tool, perform RCM self-test.

    Was the original DTC retrieved on-demand during self-test? 

    Yes  CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new RCM. REFER to: Restraints Control Module (RCM) . GO to AE11 
    No  In the process of diagnosing the fault, the fault condition has become intermittent. Do not install any new SRS components at this time. Install SRS components only when directed to do so in the pinpoint test. GO to AE10 

  11. AE10 CHECK FOR AN INTERMITTENT FAULT

    • Ignition OFF.

    • Disconnect Second Row Passenger Seatbelt Buckle C3808.

      • To access the second row seatbelt buckle sensor connector, remove the loadspace floor panel and then remove the storage compartment from behind the second row seats.
      • Inspect connector(s) (including any inline connectors) for corrosion, loose or spread terminals and loose or frayed wire connections at terminals.
      • Inspect wire harness for any damage, pinched, cut or pierced wires.
      • Inspect RCM C310A and C310B Connector Position Assurance (CPA) lever/lock for correct operation.
      • Repair any concerns found. Refer to OEM_CONNECTOR_REPAIR_PROCEDURES for schematic and connector information.

    • Connect all  previously disconnected component(s) and connector(s).

    • Ignition ON.

    • Using a diagnostic scan tool, perform RCM self-test.

    Was DTC B140D:11, B140D:12, B140D:13 and B140D:1D retrieved on-demand during self-test? 

    Yes  This fault cannot be cleared until it is corrected and the DTC is no longer retrieved on-demand during self-test.For DTC B140D:11 or B140D:1D, GO to AE2 For DTC B140D:12, GO to AE4 For DTC B140D:13, GO to AE5 
    No  The fault is not present and cannot be recreated at this time. Do not install any new SRS components at this time. Install SRS components only when directed to do so in the pinpoint test. GO to AE11 

  12. AE11 CHECK FOR ADDITIONAL SRS (SUPPLEMENTAL RESTRAINT SYSTEM) DIAGNOSTIC TROUBLE CODES (DTCS)

    • Ignition OFF.

    • Connect all  previously disconnected SRS components.

    • Ignition ON.

    • NOTE: When selecting Restraints from the Self Test menu, DTCs are retrieved from the RCM, OCSM and, if equipped, BECMB.

      Using a diagnostic scan tool, perform

      Restraints  self-test.

    Are any RCM, OCSM and/or BECMB Diagnostic Trouble Codes (DTCs) retrieved on-demand during self-test? 

    Yes  Do not clear any Diagnostic Trouble Codes (DTCs) until all SRS Diagnostic Trouble Codes (DTCs) have been resolved. DIAGNOSE and REPAIR the Diagnostic Trouble Codes (DTCs). REFER to Diagnostic Trouble Code (DTC) Chart
    No  The repair is complete. RETURN the vehicle to the customer.
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